US565219A - Weighing-machine - Google Patents

Description

(No Model.)

6 Sheets-Sheet l. F. H. RICHARDS.'

WBIGHING MACHINE.

Patented Aug. 4, 1896.

l lum Inventor:

(No Model.) 6 Sheets-Sheet 2.

F. H. RICHARDS.

WEIGHING MACHINE.

No. 565,219. Patented Aug. 4, 1896.

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F. H. RICHARDS. WBIGHING MAGHINE.

No. 565,219. Patented Aug. 4, 1896.

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Patented Aug. 4, 1896.

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Patented Aug. 4, 1896.

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NIO. 565,219'. Patented A11,q.4', 1896.

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FRANCIS H. RICHARDS, OF HARTFORD, CONNECTICUT.

WEIGHl-NG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 565,219, dated August 4, 1896.

Application tiled September 24, 1895. Serial No. 563,500. (No model.)

To all whom, t may concern.-

Be it known that l, FRANCIS H. RICHARDS, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Wei ghing-Machines, of which the following is a specification.

This invention relates to weighing-machines, the object being to provide an improved organization of valve and valve-actuating mechanisms primarily adapted for use in connection with Huid-weighing machines of the oscillatory single-chambered-bucket type.

In the drawings accompanying and forming part of this application, Figure 1 is a lefthand end elevation of a weighing-machine embodying my present improvements, the valve being shown in the open position thereof to permit the flow of the full supply-stream into the bucket. Fig. 2 is a similar View of the machine, illustrating the valve in a position to reduce the volume of the supplystream to a drip-stream. Fig. 3 is a similar View illustrating the valve in a position to cut off the supply-stream and the bucket as discharging the load. Fig. 4 is a front elevation of the machine. Fig. 5 is a plan of the same. Fig. 6 is a detail view, in plan, illustrating the fluid-chamber and certain adjacent parts of the machine. Fig. 7 is a central longitudinal section of the same. Figs. S, 9, 10, 11, and 12 are detail views of certain parts of the valve. Fig. 13 is an enlarged detail view, in end elevation, illustrating the valve-actuating mechanism and adjacent parts of the machine; and Fig. 14 is a similar view as seen from the left in Fig. 13.

Similar characters designate like parts in all the iigures of the drawings.

For convenience in illustrating the nature and purpose of my present improvements, these are shown applied to a weighing-machine of the oscillatory single-chamberedbucket type or class, and the operation of this machine is substantially similar to the one described by prior patent, No. 465,535, granted to me December 22, 1891.

The framework for carrying the operative parts of the machine is illustrated comprising two side frames or members 2 and 4,Which are shown formed integral with the end walls of the discharge-receptacle 3, which latter will be hereinafter more particularly described. These side frames or members 2 and 4 are shown connected by a plate 5,\vhich latter is illustrated carrying a stop-arm 5 for limiting the descending movement of the counterweight of the beam mechanism.

The side frames 2 and 4 will each carry a V-shaped or other beam-supporting bearing, and the side frame 2 is illustrated at 2O provided with such a bearing, and the side frame 4 (though not shown) will be similarly equipped. These bearings of the side frames 2 and 4 are adapted to support suitable pivots or knife edges carried by the scale-beam, which'latter carries the bucket and its operative devices.

The scale-beam (designated in a general way by B) will be provided with a pair of pivots or knife edges, (one of which is shown at 24,) which are adapted to rest on or be supported by the V-shaped or other bearings of the side frames 2 and 4 of the machine.

The scale-beam B is shown comprising a rearwardly-projecting weight-carrying arm 2S and a pair of forwardly or oppositely disposed bucket-carrying arms, which latter are designated, respectively, by 19 and 21. The rearwardly-projecting arm 28 is shown provided with a counterweight YV, which will be secured thereto in some suitable manner. The bucket-carrying arms .19 and 21 will carry knife edges or other suitable pivots, one of which is illustrated at 15, Figs. 1, 2, and 3, and its mate at 17, Fig. 13, and which are adapted to support V-shaped or other bearings of a pair 0f bucket-carrying hangers, and one of a pair of these V-shaped bearings is shown at 17', carried by the hanger 1G.

As a means for supporting the bucket from the rising and falling beam mechanism, the hangers 16 and 1S (shown) will be preferably employed. The bucket (designated in a general way by G) is of the single-chambered type or class, and is shown pivoted at 12 for voscillatory movement between the hangers 16 and 18, and will be normally supported with its receiving end or mouth in position to receive a stream of fluid from a Huid-chainber; and on the completion of the bucket- IOO load will oscillate for discharging the same. It will be evident then that the bucket is oscillatory for discharging the load.

The machine will be provided With the usual poisin g and counterpoising mechanisms. All that portion of the beam mechanism, including the bucket G, to the left of the beamsupports (see Figs. l, 2, and 3) constitutes the poising mechanism of the machine; and all that portion of the beam mechanism, including the weight WV, to the right of said supports constitutes the counterpoisin g mechanism of the machine.

For maintaining the bucket in the upper or normal position thereof the latch or detent mechanism shown will preferably be employed. This latch or detent mechanism is so organized that at a predetermined point in the movement of the bucket it is adapted to be tripped, thereby freeing the bucket, at which time the latter may oscillate for discharging the bucket-load.

The bucket G is shown provided With a latch or detent 40, preferably in the form of an antifrictionroller, which is adapted to be engaged by a cooperating detent 4l of a latch 42, which latter is shown pivoted at one end thereof to the bucket'- carrying hanger 1S. The opposite end of the latch 42 is shown terminating' in an inclined portion in such position as to come in contact with a :fixed or other stop carried by the side frame 4 of the machine. A stop-pin 46 is shown carried by the side frame 4, and the portion 45 normally stands free of said stop-pin; but, at a predetermined point in the descent of the bucket, said port-ion 45 is carried into contact with the stop-pin 4G. It will be obvious that on the further descent of the bucket the latch 42 Will be raised, thereby disengaging the latch-detent 4l from the cooperating detent 40, carried by the bucket. These detents 4l and 40 and the latch 42 and the stop-pin 46 Will be so organized as to permit the release and consequent oscillation of the bucket immediately on the completion of the bucket-load. Means will also be provided for limiting the oscillatory motion or tilting of the bucket during the making up of the bucket-load. The bucket-carryin g hanger 16 is shown provided with a detent or stop, the upper face of Which Will be preferably in the form of a knife-edge, and which latter is adapted to be engaged `by one of a series of teeth or notches of a rack 39, formed on the detentlever 42. The detent-lever 42 is shown pivoted to the side frame 2 and Will have a descending movement with the bucket until at a predetermined point in the descent of the bucket it Will be engaged by a suitable tripping-stop on the side frame 2, (see Fig. 3,) and it will be obvious that when said detent-lever 42 is engaged by such stop 4U' the former will be raised, thereby freeing the rack 39 from the detent 40. This action Will take place at a point just preceding the completion of the bucket-load, whereby the latter will be permitted to oscillate in the manner previously described.

It will be remembered that the bucket G has been described as oscillatory for discharging the bucket-load. The center of gravity of the loaded bucket will be located at one side of the pivot of the loaded bucket, so that when the detent mechanism hereinbefore described has freed the bucket the latter will instantaneously oscillate for discharging thc bucket-load. The bucket discharges its load of fluid into the discharge-receptacle 3, which is shown provided with a discharge-pipe D for conducting the fluid therefrom and into suitable vessels or other devices provided for this purpose. The end walls of the bucket G are shown provided With Weights vof suitable size for returning the bucket from the bucket-discharge position (see Fig. 3) to the normal or stream-receiving position. (See Fig. l.)

The side-fraine-connectin g plate 5 is shown having formed at the upper extremity thereof a supporting-flange 5", which is adapted for supporting the luid-chamberll in a manner to be now described. A fluid-chambcr-surrounding jacket or casing is shown at 50, having formed integral therewith a flange 5l, which latter will be secured to the flange 5" of the connecting-plate 5 in some suitable manner, as by the bolts shown. The jacket 50 is also shown provided with a longitudinal slot or opening to permit of the entrance and Workin g stroke of a valve openin g and closing actuator, which opening will be coincident With a second opening formed in the fluidchamber H. The jacket 50 is also shown provided at a point near its outer end With an upwardly-extending U -shaped yoke 53,which is adapted for carrying the valve openin g and closing actuator and other operative and stop devices, in a manner to be hereinafter described.

The fluid-chamber H will be seated tightly in place Within the jacket or casing 50, and is shown provided in the underside thereof with a Supply port or opening to permit the flow therethrough of the supply-stream into the bucket G.

As a means for supplying the fluid-chamber Il.' With fluid, the supply-pipe S will preferably be employed. The outer end of the huid-chamber Il is lalso shown provided with a removable air and fluid tight screw-plug 53. The fluid-chamber is also shown provided in its upper face With a longitudinal slot 53, coinciding with the slot in the casing or jacket 50, and through these slots a valveactuator, to be hereinafter described, has its Working strokes.

As a means for controlling the supplystream, the balanced slide-valve will preferably be employed. Said valve will be operative for reciprocatory sliding movement Within the fluidchamber, and will also be provided with the usual packing or packingrings, serving their Well-known purpose, and

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the packing or packing-rings arc shown held in place by the hollow or apertured screws 55 and 56.

As hereinbefore stated, the stream-controlling valve will preferablybe a balanced slidevalve, and during the reciprocations of the valve in its opening and closing movements this forms at the outer end of the Huid-chamber I-l (what is the left in Figs. l, 2, and 3) a compartment, which will hereinafter be termed a balance-compartment, and which is adapted for containing a small portion of fluid which flows therein from the supplypipe S in a manner to be nowdescribed, and acts as a fluid-balan ce or a counter-resistant to the main body of fluid in the Huid-chamber and in the supply-pipe S.

The valve is shown provided with a bore longitudinally thereof, (designated by 71,) which is of relatively small diameter, and through which flows a iine stream of fluid into the balance-compartment of the fluidchamber, and which fluid, when in the balance compartment, constitutes a fluid -balance. Means will be provided for regulating the flow into and out ofthe balance-compartment of this streamof material. The valve is shown provided with a plug or small valve 72, which will have a limited reciprocal movement within a seat formed in the outer end of the stream-controlling valve 70, the outward movement of this plug'or valve 72 being limited by the hollow screw 55, which holds the valve-packing in place. The plu g or valve 72 is shown provided with-a series of induction-ports, (four in number, and designated by 7 2,)'which are shown inclined and narrowest at their inner or receiving end or the point where the small stream flows into the balance-compartment of the huid-chamber. The inner end of the plug or valve 72 is shown conical, and this conical portion is adapted to fit a correspondingly-formed seat in the valve, and when the stream-controlling valve 70 is in the closed position thereof (see Fig. 3) this conical portion of the plug 72 will be seated tightly in place within its seat, so that the fine stream of fluid from the supply-pipe S cannot then flow into the induction-ports 7 2 and the balance-compartment of the fluidchamber. The induction-ports 7 2' are shown formed a slight distance back of the apex of the conical portion of the plug 72, so that it will be apparent that when the solid portion of the conical part of the plug 72 is in its seat the inflow of the fine stream, hereinbefore referred to, will be effectively checked.

The plug or valve 72 is shown provided with an opening. 57 of relatively large diameter, and a second but smaller opening 58 communicating therewith, and also with the balance-compartment, which provides for the slow egress of the fluid from the balance-compartment on the opening movement of the valve, and hence the opening` movement of the valve will be correspondingly slow by the gradual reduction in volume of fluid within the balance-compartment. On the opening movement of the valve the pressure of the fluid in the balance-compartment tends to quickly force the conical portion of the plug 72 against its seat within the valve 70, and the egress of the fiuid from the balance-compartment of the Huid-chamber will be so regulated that there will remain in said balancecompartment sufficient of the iiuid to withstand the pressure of opening the valve, so that said opening movement will be even and unattended by jerky movements. The main body of fluid on the other side of the valve, opposite to the balance-compartment, acts as a cushion or as a {luid-balance on the closing movement of the valve. In addition to securing even opening and closing movements of the valve, the power necessary to actuate the same will be minimized, as the pressure of fluid in the fluid-chamber on both movements acts as an aid to the valve opening and closing actuators, and also prevents sudden movements of the valve in either directionan undesirable feature in iuid-scales. The valve 70, approximately centrally thereof, is shown provided with a peripheral groove or channel 7 3, in which will work a valve opening and closing actuator. v

On one movement of the valve it will be apparent that the supply-port 54 in iiuidchamber H will be opened to permit the flow therethrough and into the bucket of the supply-stream, and on the opposite movement the supply-port will be closed, thereby cutting off the supply-stream. The casing 50 is shown provided with a second casing or hood 59, depending therefrom, which acts as a scatter-guard and prevents scattering of the fluid when this leaves the supply-port 54, thereby insuring the iiow of the whole supply-stream into the bucket.

As a means for actuating the valve 70 to open and close the same, l prefer to employ the valve-actuating mechanism shown. A combined valve opening and closing actuator will preferably be exnployed,which is separate from the valve, the valve-opening and valveclosing movements of which will be regulated and governed by the movements of the poising mechanism of the machine.

A combined valve opening and closing actuator is shown at 80, pivotally supported for rocking or oscillatory movement between the arms of the yoke 53. The combined valve opening and closing actuator is shown consisting of an angle-lever, and the arm 82 thereof is shown counterweighted at 8l. The arm 82 is also shown provided with a slightlycurved workin g face or cam-face 82', the purpose of which will be hereinafter described.

The second arm 83 of the valve opening and closing actuator, also termed the actuatingarm, will have its working strokes between the end walls of the coincident longitudinal slots, formed, respectively, in the iiuid-chamber casing 50 and the fluid-chamber H, and the lower end of said arm 83 is adapted to IOO IIO

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engage the valve for actuating the same by entering the peripheral groove or channel 73 of the valve 70, to be loosely operative therein by having a limited movement in said groove or channel.

The poisin g mechanism, as hereinbefore stated, governs or controls the movements of the valve-actuator SO, and this will be normally supported by said poising mechanism. The poising portion of the beam-arm 2l of the scale-beam B, which is that portion of the scale-beam located at the left in Figs. l, 2, and 3 of the beam supports or pivots, is illustrated having secured thereto in some suitable manneras by the fasteningscrews shown-a relatively long outwardly-projecting stop or limiting arm 84e, which is adapted to support-when the bucket is in its uppermost position and the valve open (the normal position, as shown by Fig. 1)*the curved or working face of the arm 82, and hence the weight 8l of the valve opening and closing actuator 80, and the closing movement of the valve-actuator S0 will be limited by this arm, so that, at a predetermined point in the descent of thebucket andthe scale-beam B the arm 84, which normallysupports said weight 8l, will fall slowly from under said weight 8l and permit a closing movement of the valve. Hence it will be apparent that said arm 84C constitutes a means for limiting the valveclosing movement of the valve-actuator 80. The closing movement of the valve-actuator S0 will be intercepted at a predetermined point in the descent of the bucket, and this action occurs at the commencement of the poising period, whereby the valve will be held against closing movement to permit the How into the bucket of a reduced or the drip stream, which is generally necessary to complete the partial bucket-load.

The fluid-chamber casing or jacket 50 is shown provided with a pair of brackets or lugs and 90, between which is shown pivoted for oscillatory movement a limiting latch or stop 90. The arm S3 of the valve-actuator SO is shown provided with a longitudinal slot S3', in which is shown pivoted an antifrictionroll 83", which serves as a stop, and which is adapted to be engaged bya cooperating stop or detent of the latch 90, to thereby limit the valve-closing movement of the valve-actuator and hold the valve temporarily against further closing movement.

The latch or stop 90 is shown provided with a laterally-extcndin g limiting stop-arm or detent 91, which is adapted to engage the stop S3", carried by the arm S3 of the valve-actuator SO, to thereby hold the said actuator 8O against movement, and thereby the valve against closing movement.

'lhe latch or stop 90 will be released by a tripping or releaser device on the further movement of the descending bucket, thereby insuring an instantaneous closure oi' the valve through the agency of the counterweighted valve-actuator 80. A tripping or releasing lever is shown at 85 in the form of a counterweightcd lever, the weight thereol' being illustrated at 85'. This tripping orreleasing lever 85 is illustrated having a rocking movement between the arms of the yoke 53 and about the same center of movement as the valve-actuator S0, a common pivot i'or these two members being illustrated at S0'.

The tripping movement of the latch-releasing lever 85 is limited by a suitable stop, which is illustrated carried by the beam-arm 2l of the beam mechanism. The beam-arm 2l is shown carrying a bii' urcated bracket 2l', between the arms of which is pivoted the stop 2l, preferably in tle form of an antifriction-roll, as shown. the tripping or rcleasing lever S5 is shown vrith a limiting-face, (illustrated as a cam-face fli4l, Fig. 13.) As the bucket and beam mechanism descend the stop 2l" falls slowly from under the limiting-face SU of the latch-releasing lever 85, permitting a rocking movement to the left of its pivot. (See Figs. l, 2, and 3.) A second stop-face SG is also shown formed on the latch-releasing lever 85, and which stop-face is shown as nearly a straight face and merging in the li miting-face 8G. It will be obvious that when the stop or antifriction roller 2l leaves the limiting-face S6 and rides over the straight face SG a sudden movement of the releaser device will follow, and this sudden movement will be utilized for tripping the 'latch 90, whereby the valve 7 O may be closed,to thereby quickly cut off the su ppl y-stream by the valveactuator SO. On the ascending movement of the beam mechanism, and hence ofthe beamarm 2l thereof, the antiiriction-roll 2l on said beam-arm will engage and ride over the stop-face SG,which is carried by the lever S5 at a point below its center of movement, thereby slowly oscillating said lever 85. Leaving the stop-face SG', the roll 21, on the continued ascent of the beam-arm, will engage the connected stop-face 8G of relatively greater elliciency than the stop-face 86, thereby imparting an accelerated oscillatory movement to the lever S5 and throwing this over to its normal position, as indicated by Figs. l. and lil. So long as the antifriction-roll 2l" is in its uppermost position, as indicated in Figs. Il, and 13, the antifriction-roll 2l, engaging the stop-face 86, will positively hold the lever S5 against movement in either direction, the tendency, however, of this lever being to oscillate to the left, as the center of gravit-y thereof, as has been hereinbefore stated, is located at that side of a vertical line intersecting the center of movement of said lever. Hence on the descending movement of the beam mechanism the stop 2ltends to limit the shifting movement of the lever S5 and the latch-releasing device which is operative therewith. rlhe hub 87 of the lever 85 is shown provided with a projection S7', constituting a releaser device, which is adapted to come in contact TOC IXO

with a properly-positioned arm on the holding-latch 90 to thereby trip the latter, so that the valve may be closed.

The latch 90 is shown provided with an upwardly-extending arm 92, which is provided with a laterally-projecting stop-arm 92', having a stop 92", adapted to be engaged by the projection 87' of the latch-releasing lever 85. It will be understood that when the stop 92"' is so engaged by the projection 8'7 of the latch-releasing lever the latch 90 will be raised or oscillated about its pivot, and that the detent 91 of said latch will also be raised clear of t-he stop S3 of the arm S3 of the valve-actuator 80, thereby freeing the valve and this arm 91, on the closing movement of the valve-actuator, will be projected into the slot 33 of said arm S3. As a means for maintaining the latch in an operative position, Where it may engage the coacting stop of the valve-actuator on the closure of the valve, the inner arm of the yoke 53 is shown provided with a lug or projection GO, which is illustrated carrying a suitable stop, as 60', for supporting-the latch 90, to thereby maintain the latch in the operative position thereof.

The latch-releasing lever S5 is shown provided with a stop-abutment 86Irl in line with the stop-face S5', which is adapted to limit the oscillatory movement of the lever 85 in one direction by impinging against the roll or stop 21, which action takes place on the iinal closing movement of the valve.

It will be observed, on reference to Figs. l., 2, and 3, that the center of gravity of the releaser device 85 is located at one side of a vertical line passing through the center of movement of said releaser device 85-that is, at the lefthand of said lineand the movement to the left of 'said releaser device will be limited by the stop-faces SG and S6' and the stop-abutment 8G. To provide against the opposite movement of the releaser device S, a properly-positioned stop will be employed. The outer arm of the yoke is shown provided with a projection or lug 6l, which is illustrated carrying a stop-pin 61', against which the lever 85 will abut on the oppositemovement of said lever and on the ascending movement of the bucket.

A It will be remembered that a stop has been described engaging a coacting stop to hold the valve-actuator 8O against valve-closing movement at a predetermined point in the descent of the bucket. It will be obvious that when this valve-actuator is so held the bucket will continue to descend, as will also the beam mechanism; and it will also be obvious that when the valve-actuator is so engaged the weight 81 thereof will stand clear of the arm S4, carried by the poising mechanism of the machine, thereby subtracting that much weight from off the poising mechanism. The bucket-load will then be nearly complete, the valve being nearly closedthat is, in a position to permit the tlow into the bucket of the drip-stream. On the closure of the valve,vvhen the drip-stream is cut ott, the arm of the valve-actuator will be engaged by a suitable stop to hold said actuator against further closing movement, the weight thereof then being off the poising mechanism. The arm 82 of the valve-actuator is shovvnhaving formed thereon a stop-abutment 82", which is adapted to abut against a cooperating stop 62', carried by the lug 62, which is illustrated formed on the inner arm of the yoke 53. It will be obvious that on the ascending movement of the bucket and the beam mechanism the arm S4 will engage the curved face S2 of the weighted arm 82 of the valve-actuator 80, thereby raising said arm and oscillating the valve-actuator, whereby this may be effective for opening the valve. From the preceding description of the valveactuator 8O it will be evident that the valveclosing movement thereof is limited by and during the descending movement of the poising mechanism, and that said actuator is adapted to open the valve by and during the ascending movement of the poising mechanism.

The operation of a machine embodying the present improvements, briefly described, is as follows: Fig. l illustrates the normal position ofthe machine. The valve is illustrated open to permit the iiow of the full supply-stream into the bucket. When asufiicient quantity of the iiuid has been received bythe bucket, this and the beam mechanism tends to slowly descend, and in descending the arm 84, carried by the poisin g mechanism, permits a slow closing movement of the valve by falling from under the arm 82 of the valve-actuator 30. Vhen the bucket-load is nearly completed, or at the commencement of the poising period, (see Fig. 2,) the stop-arm 91 of the latch or limiter 90 Will engage the cooperating stop 83, carried by the valve-actuator 80, and will hold the said valve-actuator, and thereby the valve 70, against further closing movement, the supply-stream in the meantime, by the closing of the valve 70, having been reduced in volume to a drip-stream. When the valve is so held, the bucket G continues to descend, and at the close of the poising period, or when the bucket-load is completed, the releaser device 35 trips the latch 90, thereby raisin g the same and disengagin g the stops 91 and 83", and' also permitting the closing movement of the valve for cutting oft the drip-stream. portion 45 of the detent-lever 42 will be in engagement with the stop-arm 46, carried by the side frame, and said lever will be raised, thereby freeing the detents 4l and 40, respectively, ot the lever and of the bucket. As soon as these are released, the bucket will be immediately oscillated (see Fig. 3) by reason of the Weight of the fluid therein to the rear of the pivot of the bucket, and the bucketload will be discharged into the fluid-chamber 3, and will be conducted out the discharge- IOO IlO

At about this time the inclined pipe D, and may be received by suitable vessels or other means provided for this purpose.

Having thus described my invention, what I claim is l. In a Weighing-machine, the combination With a beam mechanism, and with a bucket supported thereon for ascending; and descending movements; of a chamber having a supply-port abered slide-valve operative in said chamber, and so located therein, as to form a space at one side thereof constituting a balance-compartment, into which fluid may flow through the bored valve; a second valve for controlling the flow of material through said bored valve and valve-actuating mechanism, operative on the ascending and descending movements, respectively, of the bucket, for opening and closing said first mentioned valve.

2. In a weighing-machine, the combination with beam mechanism and with a bucket supported thereon for ascending and descending movements; of a chamber having a supplyport; a bored slide-valve operative in said chamber, and so located therein, as to form a space at one side thereof constituting a balance compartment, and having a conical valve-seat located in an end thereof; a conical plug-valve located in said seat, and having a series of peripheral ports, which, when said valve is forced away from its seat on one reciprocation of the iirst-mentioned valve, permits the passage of a stream of material into the balance-compartment; and valveactuating mechanism, operative on the ascending' and descending movements of the bucket, respectively, for opening and clesin g said first-mentioned valve.

3. In a Weighing-machine having poising and counterpoising mechanisms,and a bucket supported by, and forming part of, said poising mechanism; the combination With a iiuidchamber having a supply-port adapted to permit the supply-stream to flow therethrough and into the bucket; of a slide-valve operative in said fluid-chamber and adapted to open and close said supply-port, said valve having also a peripheral channel; a combined valve opening and closing actuator consisting of an angle-lever having one arm of said lever loosely operative in said channel to thereby actuate the valve, and having the other arm of said lever counterweighted to thereby close the valve,and having said valve-closing movement limited by, and during the descending movement of, the poising mechanism, substantially as specied.

4. In a Weighing-machine, the combination With beam mechanism; of a bucket supported thereby; a fluid-chamber having a supplyport therein adapted to supply a stream of fluid to the bucket; a longitudinally-bored valve operative in said uuid-chamber, and located Within the fluid-chamber to form a space at one side of the valve and Within the fluidchamber, constituting a balance-compartment and adapted also for containing a body of iluid; a plug having a relatively small opening interiorly thereof and operative within the valve, and also having a conical portion adapted to be seated in a correspondinglyformed seat in the valve to thereby regulate the slow egress of the iluid from the balancecompartment, said plug also having a series of ports exterior thereof to permit the flow therethrough of a stream of material into the balance-compartment; and means for opening and closing said Valve, during the ascending and descending movements, respectively, of the beam mechanism, substantially as specified.

5. In a Weighing-machine, the combination with beam mechanism, and with a bucket supported thereon for ascending and descending movements; of a chamber having a supplyport therein; a valve operative in said chamber; a jacket surrounding said chamber, and having a downwardly-proj ectin g hood extending around said supply-port and constituting a scatter-guard; and valve-actuating meehanism, operative during the ascending and descending movements of the bucket, for opening and closing said valve.

6. In a Weighing-machine having poising and eounterpoising meehanisms,and a bucket supported by, and forming a part of, said poising mechanism; the combination with means for supplying a stream of fluid to the bucket; of a valve in position for controlling the supply-stream; a combined valve opening and closing actuator in position to have the valveclosing movement thereof limited by, and during the descending movement of, said poisin g mechanism, and also to open the valve by, and during the ascending movement of, said poising mechanism; a latch in position ior en gaging said actuator during the closing movement thereof and a releaser device in position for releasing the engagement of said latch with the said actuator to thereby permit the valve-closin g movement of said actuator, substantially as specified.

7. In a Weighing-machine having poising and eounterpoising mechanisms,and a bucket supported by, and forming part of, said poising mechanism; the combination of means for supplying' a stream of fluid to the bucket; a valve in position for controlling the supplystream; a combined valve opening and closing actuator having a stop, and in position to have its valve-closing movement limited by, and during the descending movement oi", the poising mechanism, and to open the valve by, and during the ascending movement of, said poising mechanism; a latch having a stop-arm in position to engage the stop carried by said actuator and to hold the same, and thereby the valve, against closing movement; and a releaser device for releasing said stops from engagement to thereby permit the closing movement of the valve, substantially as specified.

8. In a Weighing-machine having poising and countcrpoising mechanisms, and having IOO IIO

a bucket supported by, and forming part of, the poising mechanism the combination with means for supplying a stream of fluid to the bucket; of a valve in position for controlling the supply-stream; a combined valve opening and closing actuator having an antifrictionroll constituting a stop, and in position to have the valve-closing movement limited by, and during the descending movement of, the poising mechanism, and to open the valve by, and during the ascending movements of, said poising mechanism; a pivoted latch having a stop-arm in position to engage the stop carried by the valve-actuator to hold the same, and thereby the valve, against closing movement, said latch also having a second stoparm; and a releasing device in position and adapted to engage said second -mentioned stop-arm to thereby trip the latch and disengage the iirst-mentioned stop-arm from the stop on the actuator to thereby permit a closing movement of the valve, substantially as specified.

9. In a weighing-machine, the combination with beam mechanism, and with a bucket supported thereby; of a duid-chamber having a supply-port therein to permit the flow therethrough of a supply-stream into the bucket, and also having a longitudinal slot therein; a valve operative in said fluid-chamber, and adapted for controlling the supplystream; a removable plug seated in one end of the fluid-chamber; a jacket surrounding said fluid-chamber, and having a longitudinal slot coinciding with that formed in the fluid-chamber; and a valve-actuator in position for engaging the valve to alternately open and close the same, and having the working strokes thereof between the walls of the coinciding slots formed, respectively, in the huid-chamber and in the jacket therefor, substantially as specified.

10. In a weighing-machine having poising and counterpoising mechanisms, and a bucket supported by, and forming part of, said poising mechanism; the combination with means for supplying a stream of fluid to the bucket; of a valve in position for controlling the supply-stream; a combined valve opening and closing actuator in position and adapted to have the valve-closing movement limited by, and during the descending movement of, said poising mechanism, and also adapted to open the valve by, and during the ascending movement of, the poising mechanism; a latch in position and adapted for intercepting the valve-closing movement of said actuator; a releaser device in position and adapted for tripping said latch to thereby permit a closure of the valve; and means in position and adapted for limiting the tripping movement of said releaser device, substantially as described.

11. In a Weighing-machine having poising and counterpoising mechanisms,and abucket supported by, and forming part of, the poising mechanism; the combination with means for supplying a stream of fluid to the bucket; of a valve in position for controlling the supply-stream; a combined valve opening and closing actuator in position to have its closing movements limited by, and during the descending movement of, said poising mechanism, and also to open the valve by, and during the ascending movement of, said poising mechanism; a stop carried by the poising mechanism; a latch in position for holding the actuator against valve-closing movement at a predetermined point; a latch-releasing lever having a releasing device, and also having a stop-face adapted to engage the stop carried by the poising mechanism, whereby said stop will be effective to limit the tripping movement of said lever, and adapted also to release said lever on the descending movement of the poising mechanism, whereby the releasing device thereon will trip said latch to thereby permit a closing movement of the valve, substantially as specified.

l2. In a Weighing-machine,the combination with a bucket and with the supporting-beam mechanism therefor; of a fluid-chamber having a supply-stream port therein; a balanced slide-valve operative in said chamber; means for actuating the valve to open and close the same, and means for intercepting the closing movement of the valve at a predetermined point in the operation of the same, and also for releasing said valve, substantially as specitied.

13. In a weighing-machine having ascending and descending poising mechanism, embodying a bucket, the combination with a chamber, of a valve operative therein; actuating mechanism for opening and closing said valve a latch for engaging the valve-closing mechanism at a predetermined point in the closing movement of the valve; a releaser device operative for releasing the valve; and a stop carried by the poising mechanism for limiting the latch-releasin g movement of said releaser device.

FRANCIS H. RICHARDS.

Witnesses:

F. N. CHASE, FRED. J. DOLE.

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